2-D INVERSION OF MULTI-COMPONENT INDUCTION LOGGING DATA TO RESOLVE ANISOTROPIC RESISTIVITY STRUCTURE

摘要

High Definition Inductio Logging (HDIL) tools (10) can provide reliable information about the vertical and radial variations of resistivity (Rh1, Rv1, Rhi, Rvi) structure in isotropic media (201a, 201i). This type of logging tool utilizes transmitter-receiver arrays (101, 103, 105, 107, 109, 111, 113, 115) coaxial with the borehole (2) and thus cannot provide information about anisotropy in vertical wells. This greatly limits the application of array induction tools in the characterization of reservoirs with finely laminated sand/shale (4A-4E) sequences. A multi-component induction 3DEX tool provides the much needed ability to detect anisotropy for sand-shale laminated reservoirs. Data from such a logging tool lacks the radial resolution provides by array induction tools. Joint inversion of HDIL and 3DEX data is able to identify parameters of the invaded zone as well as anisotropic formations.